feature request: ClassCastException with description
Archie Cobbs
archie at whistle.com
Tue Jul 28 11:11:20 PDT 1998
It would be nice if when kaffe generates a class cast exception, kaffe
could set the description string associated with the exception, to help
in debugging the program.
Below is a patch to do this; however, it's probably incomplete because:
- It uses snprintf() which doesn't exist on all systems
- Not sure if the result of CLASS_CNAME(c) is suitable for
input to makeJavaString().
Could kaffe included an "official" version of this patch?
-Archie
___________________________________________________________________________
Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com
Index: kaffe/kaffevm/errors.h
===================================================================
RCS file: /cvs/mod/net/kaffe/kaffe/kaffevm/errors.h,v
retrieving revision 1.1.1.2
diff -c -u -r1.1.1.2 errors.h
--- errors.h 1998/07/10 23:00:31 1.1.1.2
+++ errors.h 1998/07/28 18:10:22
@@ -41,7 +41,7 @@
#define IncompatibleClassChangeError NEW_LANG_EXCEPTION(IncompatibleClassChangeError)
#define IllegalAccessError NEW_LANG_EXCEPTION(IllegalAccessError)
#define NegativeArraySizeException NEW_LANG_EXCEPTION(NegativeArraySizeException)
-#define ClassCastException NEW_LANG_EXCEPTION(ClassCastException)
+#define ClassCastException(M) NEW_LANG_EXCEPTION_MESSAGE(ClassCastException, M)
#define IllegalMonitorStateException NEW_LANG_EXCEPTION(IllegalMonitorStateException)
#define NullPointerException NEW_LANG_EXCEPTION(NullPointerException)
#define ArrayIndexOutOfBoundsException NEW_LANG_EXCEPTION(ArrayIndexOutOfBoundsException)
Index: kaffe/kaffevm/soft.c
===================================================================
RCS file: /cvs/mod/net/kaffe/kaffe/kaffevm/soft.c,v
retrieving revision 1.1.1.2
diff -c -u -r1.1.1.2 soft.c
--- soft.c 1998/07/10 23:00:42 1.1.1.2
+++ soft.c 1998/07/28 18:10:22
@@ -350,7 +350,10 @@
soft_checkcast(Hjava_lang_Class* c, Hjava_lang_Object* o)
{
if (o != 0 && !instanceof(c, OBJECT_CLASS(o))) {
- throwException(ClassCastException);
+ char buf[100];
+ snprintf(buf, sizeof(buf), "can't cast object to type %s",
+ CLASS_CNAME(c));
+ throwException(ClassCastException(buf));
}
return (o);
}
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